Grinding wheel



y 30, 1933- A. J. DOERMANN 1,912,069

GRINDING WHEEL Filed April 10, 1931 2 Sheets-Sheet l \\\\\\\\\w!q lllllh *llllllll M72227. A g fieri/ mzwzazzzz. My WW6? y 1933- A. J. DOERMANN 1,912,069

GRINDING WHEEL Filed April 10, 1931 2 Sheets-Sheet 2 Patented May 30, 1933 UNITED STATES PATENT OFFICE ALBERT J. DOEBMANN, OF CHICAGO, ILLINOIS, ASSIGNOB TO TITAN ABBA-51171 8110., INC., OF CHICAGO, ILLINOIS, A CORPORATION OF ILLm'OIS GRINDING WHEEL Application filed April 10,

This invention relates to improvements in grinding wheels and method of making the same and, more especially, a grinding wheel adapted for use particularly on its periphe Among the features of my invention is the provision of such a wheel made up of a plurality of relatively thin discs so that the thickness of the wheel can be varied at will by changing the number of discs there- 1n.

Another feature of my invention is to make the discs warped, bent, or curved so that they will not lie in a single plane. If the individual discs were made fiat, each lying in a single plane, it is perfectly clear that the joints between the peripheries of individual discs at the grinding edge of the wheel would be straight so that there would be likelihood of increased wear between the discs. In order to avoid this, each of the discs is warped, curved, or bent, out of a single lane, especially at the periphery. As here s own, each of the discs is provided with radial corrugations and each disc is similarly warped or shaped out of a plane to permit them to be fitted together to form a substantially solid wheel.

Other features and advantages of my invention will appear more fully as I proceed with my specification.

In those forms of devices embodying the features of my invention shown in the accompanying drawings Figure 1 is a view partly in section and partly in side elevation of a wheel mounted on the usual arbor or spindle of a grinding machine; Fig. 2 is a view of the wheel in side elevation; Fig. 3 is a top plan view of one of the discs removed from the wheel; Fig. 4 is a view similar to Fig. 3 showing a modified form; Fig. 5 is a fragmentary View of the periphery of a grinding wheel made up of discs, as shown in Fig. 4; Fig. 6 is 'a View taken as indicated by the line 6 of Fig. 4; and Fig. 7 is a view in cross-section (Fri a mold for making the discs shown in By making the wheel out of a plurality of thin discs, the wheel can be more evenly The outer part of the wheel is the same as 1931. Serial No. 529,259.

cured. The plurality of thin discs can be more uniformly made than a single thick one.

By providing a plurality of discs, it is i also possible to repair the wheel in case of injury. This can be accomplished by merely removing and replacing the discs that are damaged.

As shown in the drawings, 10 may indicate the usual arbor or spindle of a grinding machine provided with the retaining collars 11, 11 between which the grinding wheel .is clamped.

As here shown, the wheel includes 'two outer discs 12, 12 with a plurality (here shown as four) of thin discs 13, 13 held between the same. The thin-discs 13 are similarly warped or bent to permit them to be fitted together to form a substantially solid wheel and the inner faces of the discs 7o 12, 12 are similarly provided with curved surfaces to fit a ainst the discs 13. The outer faces 12 0 the discs 12 are 'flat, as shown. As here shown, the discs 13 are provided with radial corrugations 13, 13. It is obvious, however, that the discs may be otherwise warped or bent out of a plane so that the grinding surface on the periphery of the wheel will not be exposed to undue break-down of the abrasive between the laminations, as would naturally happen if the discs were ordinary straight-surfaced fiat thin wheels or discs each lying in 'a single plane. The corrugations on the individual discs 13 and on the inner faces of the discs 12, 12 are similar to permit all the discs to be fitted or. nested together to form a substantially solid wheel.

In Figs. 4 and 5, I have shown a modified form in which each disc is provided with a central thin fiat hub part, as indicated by 13". This part is somewhat thinner than the natural thickness of the disc itself and faced on each side with a metal disc 13, 13.

as described and shown in Figs. 1,2 and 3.

In Fig. 7, I have shown apparatus for making the form of disc shown in Fig. 3. As here shown, this includes a mold 14 mounted on a rotary table 15. The mold has a central openin 16 the mold cavity being indicated by 1 lIumeral 18 mdicates a spout for directing the material of which the disc is to be formed into the o n- 5 ing 16'. In making the wheel, the mol 14: is rotated and the material fed into the same from the spout 18. Centrifu al force packs the material in themold cavlt a 17 to form the disc. The mold 14 is pre erably made of two parts separable on the plane 19,so that the mold can 'be opened'to remove the disc therefrom.

While I have shown and described certain embodiments of my invention, it is to be is understood that it is capable of man modifications. Changes, therefore, in t e construction and arrangement may be made without departing from the spirit and scope of the invention as disclosed in the appended 20 claims, in which it is my intention to claim all novelty inherent in my invention as broadly as possible, in view of the prior art.

What I regard as new, and desire to secure by Letters Patent, is:

1. A grinding wheel, including a plurality of relatively thin abrasive discs of substantially uniform thickness throughout with their peripheries similarly bent to permit the same to be fitted to ether to form a substantially solid wheel, thehub portions of said discs being substantially flat.

2. A grinding wheel,- including a plurality of relatively thin abrasive discs with their peripheries similarly warped to permit the same to be fitted together to form a substantially solid whee the hub portions of said discs being substantially flat, and metal facing discs covering the surfaces of said hub portions. q t

In witness whereof, I have hereunto set my hand this 8th day of April, 1931 ALBERT J. DOERMANN. 

